WHAT is the scientific base of the great 2012 doomsday

Every each 3600 years we have to face like this situation in Sumerian documents.
The earth was in danger from planet X.This catastrophe was initially predicted for May 2003 but that day wasn't the doomsday.so.......do you think in this year-2012..?
but when nothing happened the doomsday date was recalculated and moved forward to December 2012. scientific evidance for doomsday


@influence of the galactic plane.
@There is a supermassive black hole at the center of our galaxy.
@the galactic center is very far away, approximately 30,000 light years.
@it is negligible effects on our solar system and Earth.
@about to cross the galactic plane.
@the important threats are from global warming and loss of biological diversity.
@












S G T S Kumara